<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
  
    <title>颜色</title>
    <style>
        .box{
            width: 300px;
            height: 300px;
            background-color: rgb(255, 0, 0);
            background-color: gray;
            background-color: rgba(245,125,145,.5);
            background-color: #000;
            background-color: hsl(25, 80%, 50%);
            background-color: rgb(0, 0, 0);
        }
    </style>
</head>
<body>
    <div class="box">

    </div>
</body>
</html>